# Relationship history for MSHA mine 1502057

Current hierarchy: **John T  Quintrell → Smoky Quartz → Advantage #1**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** South-East Coal Company Inc → Advantage #1; 1950-01-01 to 1988-02-10; source msha-controller-operator-history
- **controller_controls_mine:** Harry  LaViers Jr → Advantage #1; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harry  LaViers Jr → South-East Coal Company Inc; 1950-01-01 to 1988-02-10; source msha-controller-operator-history
- **controller_controls_mine:** Reading & Bates Corp → Advantage #1; 1981-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Golden Oak Mining Company Inc → Advantage #1; 1988-02-11 to 2005-05-04; source msha-controller-operator-history
- **controller_controls_operator:** Reading & Bates Corp → Golden Oak Mining Company Inc; 1988-02-11 to 2005-05-04; source msha-controller-operator-history
- **controller_controls_mine:** United  Company → Advantage #1; 2004-11-15 to 2009-04-29; source msha-controller-operator-history
- **operator_operates_mine:** Sapphire Coal Company → Advantage #1; 2005-05-05 to 2021-08-04; source msha-controller-operator-history
- **controller_controls_operator:** United  Company → Sapphire Coal Company; 2005-05-05 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Metinvest B V → Advantage #1; 2009-04-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Metinvest B V → Sapphire Coal Company; 2009-04-30 to 2021-08-04; source msha-controller-operator-history
- **controller_controls_mine:** John T  Quintrell → Advantage #1; 2021-07-30 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Smoky Quartz → Advantage #1; 2021-08-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John T  Quintrell → Smoky Quartz; 2021-08-05 to current/open; source msha-controller-operator-history